 public class Hello {
 		public static void main(String[] args){
 			System.out.println("hyc is studying java");
 		}
 }

//一个源文件中只能有一个public类,其他类的个数不限，
 class Dog {
 	public static void main(String[] args){
 		System.out.println("小狗");
 	}
 }

 class Tight {
 	public static void main(String[] args){
 		System.out.println("老虎");
 	}
 }


